A general quadrilateral: it has no specific name.
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A QUADRILATERAL has four corners and four sides, along with four angles. These do not need to be congruent (equal) but they can be.
No such shape exists.
There is no such shape. If it has two sides meeting, it also has to have a corner. A triangle has three sides and three corners, and a square has four sides and four corners. There is nothing in between.
The shape is a square.
A triangular based pyramid.